Automatic meter-reading apparatus



March 23, 194-3.,

W. LEATHERS AUTOMATIC METER READING APPARATUS A4 A5 A6 A7'A8 A a a B as a B5 B6 B7 as as .m m @m @m m @m Q Q MANUAL SELECTOR mus AUTOMATlC SELECTOR mus 45 67 1 SELECTOR LEA AUXIUARV METER INDICATDR AUXILIARY SECOND/ARV m0: c Ton 6a SELCTOR VISUAL \NDICATOR March 23, 1943. w. LEATHERS AUTOMATIC METER READING APPARATUS 2 Sheets-Sheet 2 Filed Oct. 18, 1940 SECONDARY SELECTOR DISCRIMINATOR WWW w RECORDER 1 31-2- Patented Mar. 23, 194-3 AUTOMATIC METER-READING APPARATUS Ward Leathers, Brooklyn, N. Y., assigncr, by mesne assignments, to International Business Machines Corporation Application October 18, 1940, Serial No. 361,798

Claims.

The present invention relates to the successive control of a number of devices from a point of control by the operation of a master control device at this point. The invention also relates to the selective control of such devices from the control point. In either instance the operation efiected may be either manual or automatic, as desired.

More specifically, the present invention pertains to mechanism for controlling a system of meter-reading by wire such as is more completely set forth in my copending applications for Letters Patent, Serial Nos. 349,975 and 361,801, filed August 2, 1940, and October 18, 1940, respectively, for Automatic meter-reading apparatus.

The present invention may be referred to as a console or manual, i. e. a group of immediately accessible interrelated controls whereby functions hereinafter described may be obtained by the operator as desired.

It is understood that meter-reading by wire is accomplished by means of field selectors, requiring actuating by electric impulses from the central station, in order to pass from the identifying and reading of one meter to the identifying and reading of another meter.

The object of this invention is to provide an apparatus which will enable the operator to auto matically read a series of meters, making automatic recordings of same.

Another object of this invention is to provide an apparatus which will enable the operator to selectively reach and read any individual meter out of a large series of meters.

According to another object of this invention, the maintenance of all phasing units in meters or selectors and in thi console in proper phase with each other, is contemplated.

Another object of this invention is to provide an apparatus which will keep the operator fully informed concerning the meter being read at any time and of the total meters read or to be read.

Another object of this invention is to provide an apparatus which will permit the precise and accurate selection of any meter for the reading thereof and the return of all the intermediate selectors to a proper starting position for automatic reading.

Another object of this invention is to provide associated means whereby the reading cycle for an individual meter once started must be completed in order that the phasing device in the meter be left at a proper initial position.

A further object of this invention is to insure the full and complete impulse-time necessary for operating field selectors and local numbering devices so that there shall be no chance of their getting out of phase with each other.

A further object of this invention is to provide an apparatus of this character whereby, when certain predetermined points or numbers of meters have been reached, the apparatus will cease to function or a visual indication may be rendered.

Numerous other objects of the invention not at this time enumerated will become readily apparent as the nature of the invention is better understood.

In the accompanying drawings forming part of this application, one embodiment of the invention has been disclosed for illustrative purposes.

Figure 1 is a semi-schematic, semi-pictorial electric diagrammatic view of the mechanism involved in a console-control located at the central reading station.

Figure 2 is a schematic plan showing the location of and the apparatus associated with the console-control.

Figure 3 is a detailed perspective View of a discactuating mechanism employed in connection with the present invention.

In the telelector system as shown in Fig. 2, a central reading station may be electrically connected to any one of a multiplicity of primary selectors by a three wire cable 10!. Each primary selector I00 is electrically connected to a multiplicity of secondary selectors I02, and each secondary selector is similarly connected to a multiplicity of meters I03. In the present embodiment twenty primary selectors 100 are served, each being joined by three wires to a three-contact jack as at l in Fig. 1. By means of the three-contact plug 2 the operator may select any one of the twenty primary selectors 100 in Fig. 2 by inserting the plug 2, Fig. 1, into that selectors corresponding jack. The twenty primary selectors, each of which serves 10,000 meters, are numbered A0 to A9 and B0 to B9. The present embodiment employs 200,000 meters for purposes of convenience, therefore only the A and B designations are shown in this console represented as a box H34 in Fig. 2. Where a series of 2,600,000 meters may be desired the entire alphabet would be used. If one hundred meters were Wired to each secondary or local selector and one hundred local selectors were wired to each primary selector it would give ten thousand meters to each primary selector and a series for the entire alphabet of 2,600,000 meters with serial numbers from Ail-0500 to 29-9999.

As shown in Fig. 1, a counter or register, generally characterized by the numeral 3 and advanced by a coil 4, is wired so that each time the secondary selector I02, in Fig. 2, is advanced one position by an automatic timing device I05, the coil 4, in Fig. 1, receives one pulse of electricity. The number of four digits on the register 3 is the number of a meter with respect to the other 9,999 meters served by any one primary selector. Therefore, to get the complete identifying number of any meter, the number of the primary selector (the jack number) must precede the four numerals shown on the register. For example, the meter being read in Fig. 1, (if the plug 2 were inserted in the jack B4) would be B43198, 3198 being the number shown on the register 3. (The number B43198 completely identifies one meter out of a possible 2,600,000.) This number gives the number of the primary selector, expresses the number of the secondary selector which may be indicated in any suitable manner on the reel of paper on which the reading is recorded by a recording perforator I01 in Fig. 2, the number of the secondary selector, and the two numerals that identify the meter out of a possible one hundred. The two numerals 9 and 8 shown on the register 3 in Fig. 1 correspond to the values of two fixed identifying resistances in the meter. While the meter is being read these same two numerals flash as they are read in the order in which the resistance values are arranged in the meter, in a row of ten lights 5, each one corresponding to one of the ten digits.

In the row of ten lights 5, each light represents a numeral and i actuated by a numeral selector or reading board, characterized in Fig. 2 as I08 joined to it by the cable 3|. For eXample-each time the digit 7 is read by the reading board a light in row 5 flashes the numeral '7. Thus the counter 3 indicates the number of the meter that should be read while the series of three lights in the row 5 shows the number of the meter actually being read and hence the number being recorded. The number of the secondary selector being used is found by taking the numeral 3 and 1 in the register 3 and making them into a number in the order given. The number in the example given is thirty-one. This number positively identifies that selector out of a possible 26,000 selectors.

Referring both to Figs. 1 and 3, every time the indicator wheel I in the register 3 advances it rotates a shaft, to which two discs I and II are attached, one-tenth of ,a revolution by means of apawl I99 and cam III] and follower III. On the disc I0 there are ten projections l2. Every time the .disc is rotated one position one of these projections .closes contactor I which pulses the primary selector I00 advancing it to the next secondary selector. It also rings a bell It by means of a battery I'I. When the bell IS rings the operator is informed that the reading of one hundred meters has been accomplished and makes note of it in a log. Every secondary selector I02 in Fig. 2 has a phaser generally characterized by the numeral I I3, and two identifying resistance values just like a meter. Instead of the three last numerals being the reading of a dial or register, however, they are all zeros. This enables the secondary selector to be identified just like a meter. The identifying of a secondary selector is done in place of what should be each first meter of the hundredleaving actually only ninety-nine meters to be read through the selector. The operator also checks the number timer of the new secondary selector by means of the lights 5 with the number of the selector that theoretically should now be in the circuit. If they show an error, the operator can find the right selector by a method to be described later.

Every time the counter wheel I and the discs iii and II make one complete revolution, one thousand meters have been read, and it may be desirable to stop automatic recording and change the reel of paper in the recorder. In that case, the disc II closes a contactor I I by means of a projection It thus energizing a coil 20, in Fig. l, by means of a battery I3. The coil 20 by means of a plunger ZI attached to its armature 22 opens a switch is thus shutting oiT the whole system. When the operator desires to renew automatic recording, he closes switch I9 which starts the I05, Fig. 2, and thus starts the whole system automatically working again. A cable 25 joins the console-control IM to the automatic timer I05. This auto-timer gives impulses to the secondary selector by means of a disc H5 and to the phaser in the meter by means of a disc I It. It also provides for spaces on the recording tape between different meter-readings by means of a disc III. A switch 25: in Fig. 1 is disposed in series with the phaser pulse line so that the pulse going to the phaser in the meter may be shut off any time desired. A switch 2'! is disposed in series with the secondary selector pulse line; a switch 28 with the primary selector pulse line; a switch 29 in series with the spacer line that goes to the recorder through a cable 3|. A switch 30 is disposed in series with the reading line which goes to the reading board through cable 3i and whose timing is accomplished by a disc H8 in the timer I95, Fig. 2. A switch I9 is the power switch for the timer which when opened will stop a motor I 29 after one full meterreading has been completed. This delayed stopping action is supplied by a contactor I2I and depression I22 in the disk II'I. By means of switches I9, 26, 21, 26, 29 and 36 the automatic operation of the entire system may be controlled. To start the system working the operator first closes switches 25, 21, 28, 29 and 38; then he closes the switch I9 which starts the auto-timer operating. Means also have been provided for pulsing the selectors and phasers of the system by hand instead of automatically. These facilities are needed in case a meter must be read out of sequence, or as desired. Another reason might be the desire or necessity for starting the system in the middle of any sequence instead of at the beginning. These facilities may also be used to correct an error in phase in any selector or meter-phaser, the said error being made clearly evident to the operator by the figure strip 5, or the recordings.

To pulse any part of the system manually a plug 35 in Fig. 1 must be inserted in a jack I of the desired primary selector, and the proper switches manipulated as follows: A switch 36, is in series with the meter manual pulsing line; a

secondary selector switch 37 is in series with the secondary selector manual pulsing line; a primary selector switch 33, in series with the primary selector manual pulsing line; a switch 39 in se ries with the manual spacing line. Only when one of these switches is closed and plug 35 is in a jack may one of the aforementioned operations be performed. The primary selector may be pulsed in rapid succession by closing switch 38 and ho1ding a double throw switch 40 in position II. Movement of the switch 49 to the position 4| serves to close a pair of contacts 43 and energize the motor 50 by means of the battery as. Simultaneously with the closing of the contacts 43 a pair of contacts 44 also become closed. With the contacts 44 thus closed, current from the positive side of the battery I! intermittently flows through the contacts 46, which are controlled by the projections 48 on the disc it, through contacts 44, switch 38 to the plug for pulsing the primary selector.

The secondary selector may be pulsed in rapid succession by closing the switch 37 and holding the double throw switch 46 in the position 42. Movement of the switch to the position 42 serves to close a pair of contacts 43 and energize the motor by means of the battery 5s. Simultaneously with the closing of the contacts 43 a pair of contacts 45 become closed. Upon closing of these latter contacts current from the battery ll intermittently flows through the contacts cl which are controlled by rotation of the disc .9. through contacts 45 and switch to the jack plug 35 to pulse the secondary selector. The instant the switch 451 is released, the motor circuit becomes open and the wheel will stop rotating and remain in a position that will keep contact 41 open. This is accomplished by a wheel 5! that has ratchet teeth on its edge that are canal in number to the number of projections on wheel A pawl 53 catches on one of the teeth and the motor quickly and the wheels and iii substantially instantly by means of a clutch when the switch 45 is in the off position sho When the switch is thrown to either of the on positions. the pawl. 53 is lifted from teeth of wheel 5! by lever action. Therefore, the wheels 49 and 5! are exactly synchronous the pawl will stop their rotation at a point that will keep contacts 4E and il open. Because of this action every pulse must be of full predetermined minimum time duration-partial pulses cannot be Since every pulse is full-timed the coil that steps the selector and the indicator 3 must operate simultaneously and synchronously. Such pulsing is wholly practical even at the rate of ten per second or faster. However, in cases where only one or two pulses are needed, the operator might easily send too many pulses because of the speed with which they are sent by means o so; l 40. Therefore, a dial mechanism that closes contacts fil as many times as the val of the number dialed is used to send pulses when onl a few are needed as will be described prese =.ly.

A dial mechanism 532 is provided for manually pulsing the primary selector. The contacts which are in series with the contacts of the primary selector switch 343 are adapted to be closed by the dial mechanism 52 as m 1 times the value of the numeral. which is d sled. t flowing from the positive side of the battery i through the contacts 63- and the contacts the primary selector switch 38, to the plug serves to apply impulses to the primary selector for the purpose of selection of the v .,.us sec-- ondary selectors. In order that the system may be pulsed properly, the operator must kno how many pulses he has previously efiected. The coil 6'! is so connected that it operates ach time a pulse is manually given to the primary selector. Each time it operates it advances a counter register 58 one numeral. The register 83 counts from 00 to 99 pulses anc repeats its sequence inasmuch as there are only one positions on the primary selector.

A dial mechanism 60 is also provided lor manually pulsing the secondary selector. The contacts Bl which are in series with the contacts of the secondary selector switch 3'! are adapted to be closed by the dial mechanism upon rotation of the latter. A coil 55 is so wired that it operates each time a pulse is manually given to the secondary selector and each time it operates it advances a counter register 66, similar to the counter register 68, one numeral. The register likewise counts from 00 to '99 pulses and repeats its sequence. Current flowing from the positive side of the battery I? through the contacts 5|, the contacts of the secondary selector switch 38 to the jack plug 35, serves to periodically pulse the secondary elector.

To illustrate a rather complex use of the manual means of meterueading. let it be assumed that the plug 2 is in the jack A l. The automatic counter 3 then indicates that the meter bearing the designating number M13198 is about to be read by automatic means. Should the operator, however, desire to read the meter designated by the number A4534? by manual selection, the automatic system may be stopped by opening the switch ii). The plug 2 may then be removed from the jack A4 and the plug 35 substituted in its place. The counter register 56 stands at a reading of 00 and the register stands at a reading of 31,. as previously described. Switch 38 will then be closed and, since the hundreds and thousands digits, i. e., 53, of the numeral given in the above example, represents the contact position of the primary selector (or the identity of the secondary selector) the hundreds and thousands digits actually indicated on the register -33 must be advanced to correspond with the desired secondary selector indicated by the numerals 53. This may be accomplished by manipulation of the .i-" mechanism 22 in any suitable manner to cause the required number of impulses to be made by the contacts 53. For convenience, the numeral zero may be dialed twice to cause twenty actuations of these contacts and the numeral two may be dialed once to supply the balance of the two impulses necessary to bring the total up to twentytwo impulses. Alternatively, the same result may be obtained by holding the switch in the position ii until twenty-two impulses have been eifected by opening and closing the contacts it. The register '38 will thus have been advanced to the reading 53 indicating that the correspond ing secondary selector numbered has been selected and circuits established to the same through the jack plug 35 which is received in the jack socket A4.

Since the units and tens digits given in the above example represent the contact position of the secondary selector or the number of the selected meter, the units and tens di its actually indicated on the register must be advanced to correspond with the desired meter indicated by the numeral 41. Since the register 236 indicates a reading of 00, this may be accomplished by manipulation of the dial mechanism 6 in any suitable manner to cause forty-one impulses to be made the contacts 8!. This may, for conven ence, be accomplished by dialing the numeral four times and the numeral one once. Alter natively the switch 49 may be held in position 4! until forty-one impulses have bee: by the contact -45. In either instance, the dial will register the numeral forty-one indicating that the desired meter has been selected.

To read the selected meter the switch 38 is closed, thus joining the reading board to the meter circuit. The switch 36 is closed and the switch 70 is moved to its posit-ion i I, thus closing the switch I2 and applying an impulse to the phaser in the meter. The first numeral of the meter number, i. e., the numeral 3, will be indicated by the indicator 5. Five such impulses applied by the switch "i will indicate in the row of lights 5 the numerals 4, 1, r, x, (the three xs representing the consumption figure on the meter). Having read the required meter manually, the system must be returned to a condition where automatic reading was discontinued and from which point it should be resumed. The secondary selector is first given fifty-nine pulses and then the primary selector is given seventy-eight pulses, by methods described to bring the registers 58 and 66 back to their zero indication. Meter ninety-eight on local selector thirty-one is now in the pulse-read circuit. Interchange plugs at A l. First close switches 26, 2?, 29 and 35; (reestablish recorder circuit at recorder) close switch I9 and automatic-recorder functions are resumed. By thus pulsing the primary and secondary seleotors, any meter in the entire system can be brought into the reading position. It should be noted that since the local selector is provided with identifying resistors and a phaser as aforementioned, the meter number A453G0 was passed or momentarily selected while selecting meter A45341. As a check on the accuracy of the procedure thus far completed, the local selector 53 might well have been identified by stopping the selection long enough to read the numeral Ae3000 in the manner previously described.

If a meter whose sequence number is 47 records 76454 (inclusive of meter number and register reading) obviously the phaser or stepping coil in the meter is one position out of phase. To correct this condition insert the plug 35 in its proper jack, close the switch 36, and push switch I5 into position ll once. This closes contact I2 once and pulses the phaser in the meter once by means of battery ii and the meter pulsing circuit. This circuit is completed each time switch 38 and contact I2, being in series, are both closed. Meter 4'? will now record 47645.

It may be desirable to leave blank spaces between meter-reading on the paper record tape or to make other separation. To do this switch 39 must first be closed. Then switch It is pushed to position l3 as many times as there are spaces desired. Pushing switch 15 to position l3 closes contact it which completes the spacing circuit to the recorder as long as switch 33 is closed.

While there are only three outgoing lines in cable ilil, four separate and distinct functions are to be accomplished. The reading of a meter and the pulsing of the phaser in the meter are accomplished over the same wire but at different times. The timing is accomplished by the timer I55, Fig. 2, to which cable 25 is joined. Secondary selector pulsing and reading is accomplished over one wire, and primary selector pulsing over another. This makes up the total of three wires. All circuits use ground as a common return.

The actual reading of the meter is accomplished by means of the reading board IE8. The resistor I83 in the meter I03 is connected in series with the battery I1 and a voltmeter I30. The voltmeter I33 has a small mirror I3I mounted on the axis of the indicator needle instead of the needle. An electric bulb I32 powered by a battery I3I sends light through a lens system I34 which concentrates the light into a strong parallel beam. This beam of light is directed upon the mirror I3I in such a way as to reflect the light to one of ten photocells I35 depending upon the deflection of the meter, and therefore upon the angular displacement of the mirror. The resistor IE3 controls the amount of current flowing through the meter I35 and there-fore the amount of rotation given to the mirror I 3I. If the resistor should cause the mirror to reflect the beam of light onto the first photocell I35 a relay I35 would be energized by means of the photocell and an associated vacuum tube circuit I31. When the relay I35 closes, the bulb number one in the light row 5 in Fig. 1 is illuminated. A relay CI in a coder, generally characterized by the numeral I38, is actuated at the same time by means of a battery I45. The relay closes two circuits. One circuit advances a tape I 32 in a perforator IN. The other circuit causes a coil P6 to actuate, thus causing a hole to be perforated in a tape M2. This hole represents the numeral one in a special code. Each of the ten digits 0, l, 2, 3, 4i, 5, 6, 7, 8 and 9 is represented by one or more of the holes punched by coils PI, P2, P3 and P6. The process of reading, coding and recording is explained in more detail in application for Letters Patent Serial No. 349,975.

The timing of the entire mechanism is accomplished by the timer I05. As soon as the motor iZH is started the disc H6 causes a pulse of electricity to be sent over wire in cable IIJI. This pulsation causes a relay I45 to operate, thus opening a contact I46 and closing a contact I41, and advancing a contact arm M9 one position to a contact I50 by means of a ratchet I5I and a pawl I522. The relay I45 is now completely removed from the circuit because of the opening of contact I 46. However, it remains energized for an interval because of the influence of the copper jacket I55. The first resistance to be read is introduced into the circuit by the closing of contact Ml. The first resistance is connected in series with the voltmeter I30 and the battery I! by means of the timer disc II 8. The voltmeter I35 will rotate the mirror I3! a definite angle. The beam of light from the lamp I32 i then reflected to one of the ten photocells I35 thus causing one of the ten tube circuits I31 to close one of the ten relays I36. A digit corresponding to the resistance in the meter is then recorded on the tape I42 by the perforator I51 after being coded by the coder I33. After the first numeral has been read and recorded in this manner the relay I45 in the meter IE3 will return to the normal position. This sequence of events repeats five times and then the disc I IT in the timer causes three blank spaces to be recorded on the tape I42. The disc H5 will cause an electro-magnet H5 in the secondary selector Hi2 to advance two arms I 56 and I5! to the next position by means of a pawl I 59 and ratchets I59 and IBI. This causes another meter, similar to meter I83, to become wired into the reading and pulsing circuit from the central station. If the switch I9 in the console-control I 84, Fig. 1, is open, the timer will automatically stop when the depression I22 in the circumference of disc I I! causes contacts IZI to open. If switch I9 in Fig. l is closed the timer will continue to operate. After the secondary selector has been advanced one hundred times an electro-magnet I63 in the primary selector IilIJ advances two arms I54 and 65 to the next contact thus connecting a new secondary selector I02 to the main line. Each secondary selector has in it a complete set of reading equipment II3 just like the meter I93.

The secondary selector itself is then identified in place of what should be the first meter. Since there is no consumption record to be transmitted the first three numerals carry only intelligence and are used for identifying the secondary selector.

What is claimed is:

1. In an impulse sending device for transmitting a predetermined number of electrical impulses over a circuit to actuate a remotely disposed step-by-step mechanism, a source of impulse current, a normally open impulse sending switch in said circuit adapted to be periodically closed to close the circuit through the source and create an impulse in the circuit, a counter mechanism for cumulatively indicating the impulses applied to the circuit, a solenoid for actuating the counter mechanism and operatively connected in the impulse circuit, an electric motor,

means operable upon actuation of the motor for periodically closing the switch, a motor circuit and source of current supply therefor, a manually operable switch for closing the motor circuit at will for an approximate predetermined length of time to cause the motor to actuate the impulse switch and cause the counter mechanism to approximately indicate the predetermined number of impulses, a second impulse switch in the impulse circuit in parallel with said other impulse sending switch, and manually operable means for opening and closing the latter impulse sending switch a selected number of times at one manual operation thereof to transmit to the impulse circuit a number of impulses sufiicient to bring the total number there of applied to the circuit by both switches to the predetermined number.

2. In an impulse sending device for transmitting a predetermined number of electrical impulses over a circuit to actuate a remotely disposed step-by-step mechanism, a source of impulse current, a normally open impulse sending switch in said circuit adapted to be periodically closed to close the circuit through the source and create impulses in the circuit, an actuating arm carried by the switch, a wheel mounted for rotation about an axis, a plurality of cam projections on the wheel designed for contact with the arm to periodically close the switch upon rotation of the wheel, an electric motor, means connecting the motor and Wheel in driving relationship, a toothed wheel mounted for rotation about an axis, means synchronizing the movements of the two wheels, a motor circuit and a source of current therefor, a manually operable switch for closing the motor circuit at will for an approximate predetermined length of time to cause the motor to rotate said wheels to actuate the impulse switch a number of times commensurate with the length of time the motor circuit is closed, a braking pawl normally engaging the teeth on said toothed wheel, means connecting the pawl and manually operable switch for withdrawing the pawl from engagement with said teeth when the latter switch is closed, a second impulse switch in the impulse circuit in parallel with the other impulse sending switch, and manually operable means for opening and closing said latter impulse sending switch a predetermined number of times at one manual operation thereof.

3. In an impulse sending device for transmitting a predetermined number of electrical impulses over a circuit to actuate a remotely disposed step-by-step mechanism, a source of impulse current, a normally open impulse sending switch in said circuit adapted to be periodically closed to close the circuit through the source and create an impulse in the circuit, an electric motor, means operable upon actuation of said motor for periodically closing the switch, a motor circuit and source of current supply therefor, a manually operable switch for closing the motor circuit at will, means operable when said manually operable switch is open for applying a braking torque to the motor, means for rendering said latter means ineiiectual when said manually operable switch is closed, a second impulse sending swi ch in the impulse circuit in parallel with said other impulse sending switch, and a finger release dial mechanism for actuating the latter impulse sending switch a predetermined number of times at one operation thereof.

4. In an electrical transmitting and recording system, a plurality of groups of meters, means for successively selecting a group of meters, means for successivel selecting a meter within a group, a central recording station, a plurality of impulses transmitting channels connecting the meters of each group to the central station, a trip register at the central station including a plurality of geared indicating elements decimalindividual meters within the groups and certain other higher digital indicating elements serving to indicate the selection of the meter groups, means operable upon selection of each meter for tripping the register, and means operable upon movement of said higher digital indicating elements for rendering said meter-group selecting means operative.

5. In an electrical transmitting and recording system, a plurality of groups of meters, means for successively selecting a group of meters, means for successively selecting a meter within a group, a central recording station, a plurality of impulse transmitting channels connecting the meters of each group to the central station, timing mechanism (l 5) for sequentially operating said latter selecting means, a motor for driving said timing mechanism, means for energizing the motor, a trip register at the central station including a plurality of geared indicating elements decimally related in ascending digital order for sequential movement incrementally in a decimally progressive sequence, certain lower digital indicating elements serving to indicate the selection of individual meters within the groups and certain other higher digital indicating elements serving to indicate the selection of the meter groups, means operable upon selection of each meter for tripping the register, means operable upon movement of said higher digital indicating elements for rendering said meter-group selecting means operative, and means operable upon movement of said higher digital indicating elements for rendering said timing mechanism inoperative.

WARD LEATlE-ERS. 

